The greatest speciality of this work is using chimneys with different heights above the condenser instead of a condenser's fan on the vapour-compression refrigeration/heat pump system chosen as an experimental set. Exergy analyses of natural convection with and without chimneys and forced convection on the same experimental set have been made with acceptances of steady state-steady flow system on each part of the set. Temperatures and pressures on each point of the system are measured and then specific enthalpies and entropies of them are determined. The coefficients of performance in refrigeration and heat pump modes and the exergies of each point, irreversibilities and second law efficiencies for each part of the system are calculated and given in tables comparatively. In this study, it is seen that the values for natural convection with chimney are between the forced convections and natural convections.

Related articles

Better Planet was selected to design, supply, install and commission two brine to water heat pumps with a combined thermal output of 70 kW for this castle in Oxfordshire replacing oil heating.
In preparation of the project, Better Planet carried out a room by room heat loss calculation allowing us to advice the client on required upgrades of radiators in some of the rooms given that heat pumps operate with a lower flow temperature than oil boilers. We also carried out a draft EPC making it possible to accurately...

Better Planet was selected to design, supply, install and commission a Ground Source Heat Pump and Underfloor Heating in connection to an ongoing comprehensive renovation of this Manor House in Hertfordshire.
Our involvement started with a room by room heat loss calculation allowing us to size the heat pump and design the underfloor heating. We also carried out a draft EPC allowing us to accurately predict future payments under the domestic RHI scheme.
Heat is collected from a field using 1.2 km of 40mm collector...

The space heating and hot water for this property was previously done by an oil boiler. The client was considering a ground source heat pump in order to lower running costs and benefit from tariff payments under the Renewable Heat Incentive (RHI).
Better Planet carried out a room by room heat loss calculation. This is required in order to size the heat pump correctly, but it is also an input in the assessment of the heating distribution system – in this case a combination of underfloor heating and radiators....

Initial contact
The initial contact is often on the phoneand we try to establish if an air source heat pump makes sense from a financial and technical point of view. Heat pumps makes sense for most new built projects. For retrofits, heat pumps makes most sense for properties not connected to the gas grid. If you are connected to the gas grid, you should only consider a heat pump if your property is well insulation and you have a heating distribution system allowing you to operated the system with low flow...

Ground Source Heat Pumps are energy-efficient HVAC systems usually adopted in residential and commercial buildings. However the control of the thermal environment is required not only in spaces occupied by people, but also in intensive breeding farms, in order to maintain healthy conditions and to increase productivity. In the Italian livestock breedings, heating is usuallyprovided by means of gas or Diesel burners directly installed in the stable. An important part of the heating load is due to the large ventilati...

Customer comments

No comments were found for Exergy analysis of a vapour-compression refrigeration/heat pump cycle with chimney. Be the first to comment!